Malicious PDF — malware analysis report

Static analysis result for SHA-256 86603237d5e4fe6e…

MALICIOUS

PDF

75.6 KB Created: 2021-08-30 11:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21a0e20fda4f9e1a03dc3073b063b968 SHA-1: a8a0101cf6d544b13fd48fcc7c39b1b6ce0ac288 SHA-256: 86603237d5e4fe6ee209cf22492ba765731712047ced60580e59d27b0b9d99b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of these links indicates an attempt to lead the user to a harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/36ffe616356144baa6b563f484bf6687/4555771858.pdf In PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/98949486489.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7380ecc0566f56d67632b0e0bc17ec64/newofezewarajutujoredox.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/23745670383.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/beeaa49b009c3d13006c3ceb3dc50d82/31133766702.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094aaabd27fb---wexetu.pdfIn PDF document text
    • http://freeski.hu/freeski/file/60666662666.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/pinepuzazadugelur.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2lt6smvicnappchko50gr2q1ko/14274056980.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/wuzipigigamudisawef.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ca4647ecd987734937339ce4e334f3f0/12526578442.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/gezovipalaturepofijidos.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/raxamavagowonukagoxu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e7d8b11e---67873760017.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6domv4vpmgclhh2tm0rk3dmfl3/70872178067.pdfIn PDF document text
    • http://coclub-us.com/ckupload/files/47414497261.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/36037712286.pdfIn PDF document text
    • http://irths.com/upload_files/files/gugudisabitowasuzabuf.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/puxitegodudowesugo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e65d1910---75902997535.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/25998374883.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/60607794449.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6477bb4793c3ed23c7111c3ad4093406/kijinefu.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/19450133593.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/pusomatukopifelawiriwuwaz.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/makawivonevililefovexox.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/26fc6938e9674c4a731b3d6d4b54aabc/wufajejegadorubeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=all+the+wrong+moves+kickin+itPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 17516 bytes
SHA-256: d23c9b0a9d51b6eda225bd050011a1a8b188679c29109dd70e7e7ad92f14a7b3
font_02_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 10740 bytes
SHA-256: 5d632efd2c26459beb558d548652b7540addf1e47bb968cb1841b3402eb3c0ac

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